68990128 has 40 divisors (see below), whose sum is σ = 138721280. Its totient is φ = 33203520.

The previous prime is 68990123. The next prime is 68990137. The reversal of 68990128 is 82109986.

It is a happy number.

It is a super-2 number, since 2×68990128² = 9519275522912768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68990123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181843 + ... + 182221.

It is an arithmetic number, because the mean of its divisors is an integer number (3468032).

Almost surely, 2^68990128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68990128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69360640).

68990128 is an abundant number, since it is smaller than the sum of its proper divisors (69731152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68990128 is a wasteful number, since it uses less digits than its factorization.

68990128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 68990128 is about 8306.0296170914. The cubic root of 68990128 is about 410.1370313325.

The spelling of 68990128 in words is "sixty-eight million, nine hundred ninety thousand, one hundred twenty-eight".